How exactly do bombs work do you have to declare what template your using and where your dropping it or can you measure out first to see if you'd like to do it? I only ask because the new firespray will have so many options.

As a rule of thumb, never measure until you're committed to doing something. Also, Emon is the only pilot with any option for templates, and based on boost/barrel roll, I'd say you have to declare your template beforehand, without any premeasuring.